In the PCBA processing process, the soldering process is one of the most important processes, and solder paste, tin bar and
tin wire are commonly used soldering materials in the soldering process. The difference between the three welding materials is not very clear. Let's take a closer look at the difference between the three!
1. Difference of ingredients;
The composition of solder paste is mainly composed of tin powder and flux. Because of the addition of flux, the solder paste can be directly used for soldering. There are two kinds of tin wires, one is flux-free. , its main component is tin alloy, which cannot be directly used for welding. One contains flux, which is mainly composed of tin alloy and flux, which can be directly used for welding; the composition of tin bar is pure tin, which is used in welding. It is necessary to add flux when it is used;
Second, the application process is different;
The PCBA soldering process mainly includes three soldering processes: wave soldering, reflow soldering and post soldering, and these three soldering processes use different soldering materials. Among them, solder paste is mainly used for reflow soldering process, and the quality of solder paste It will directly affect the welding effect. If there is a problem with the quality of the solder paste, it will lead to defects such as less tin, more tin and tombstones;
The tin bar is mainly used in the wave soldering process, which is mainly composed of lead and lead-free. Because the tin bar is made of pure tin and has no soldering ingredients, it is necessary to add flux before welding; the tin wire is It is mainly used for post-welding processing; it is used in conjunction with a soldering iron. It should be noted that tin wire without flux cannot be used for the welding of electronic products, because its lack of wettability will lead to undesirable phenomena such as spattering in welding;
In addition to the above two differences, there is also the difference in their shapes, the tin bar is in the shape of a strip, the solder paste is in the shape of a mud, and the tin wire is in the shape of a wire; the above is the difference between the tin bar, the tin wire and the solder paste, Although there are different differences between the three, the roles they play are the same, that is, they are all used for PCBA soldering and are irreplaceable.
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